地震波斜入射对高面板坝地震反应的影响

Influence on Seismic Response of High Concrete Face Rockfill Dams Due to Obliquely Incident Seismic Waves

摘要:

为研究地震波斜入射对高面板坝地震反应的影响,根据地震波动入射理论,采用FORTRAN进行波动荷载的编程计算,并与大型通用有限元软件ADINA相结合,实现基于黏弹性人工边界的地震波斜入射,研究P波和SV波分别以不同角度入射对高面板堆石坝地震反应的影响。结果表明,地震波斜入射时大坝地震动反应与垂直入射时明显不同,常规垂直入射的结果偏于不安全,因此在高面板坝地震反应分析和抗震设计中应考虑地震波斜入射的影响。

Abstract:

Oblique incidence plays a vital role in spatial variation, which has a considerable influence on high concrete face rockfill dams. This study uses seismic wave incidence theory to determine the influence of oblique incidence seismic waves on the seismic response of high dams. FORTRAN programming is applied to calculate the wave load, and finite element software ADINA is employed to achieve the oblique incidence seismic wave input based on the viscous-spring artificial boundary. Simultaneously, the impact of P wave and SV wave that have different incident angles is analyzed with respect to the seismic response of a high concrete face rockfill dam. From these results, it can be determined that the oblique incidence seismic wave is significantly different from the normal incidence. With an increase in the incident angle of P wave, the peak acceleration and peak displacement in the horizontal components gradually increase, while the peak acceleration and the peak displacement in the vertical components gradually reduce; this is opposite to the case of the incident SV wave. Therefore, the security of the dam cannot be ensured if only the influence of normal incidence is considered, and it is necessary to consider the oblique incidence of seismic waves in seismic response analysis and the seismic design of high concrete face rockfill dams.